New ‘Pretty Little Liars’ Halloween Video: Mona Is CrAzier Than Ever

In this first-look clip, Mona reveals her wicked plAns for the ‘Liars’ this Halloween!

Hearing the classic children’s ditty “Teddy Bear Picnic” used to conjure up loving memories of my mom lulling me to sleep as a baby — but thanks to this beyond-creepy new clip of Mona (Janel Parrish) singing it on the Oct. 23 Pretty Little Liars Halloween special, I’ll never be able to listen to it again. Ever.